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2 2018

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Reinforcement of composite pipelines for multipurpose transportation

Trykoz L., Kamchatnaya S., Pustovoitova O., Atynian A.

Transport Problems

2018

T. 13, z. 1

69--79

The problem of monolithic behavior of a metal pipe and fiberglass safety cage has been considered in the article. The prestressed case does not only decrease the deformability of a pipe on-load but it also protects metal from corrosion. The ability to withstand the arising stresses has been investigated for both strip fiberglass reinforcement and the whole construction. It has been shown that the deformability of fiberglass depends on the kind of binder. The maximum strength value has been obtained while gluing glass fibers with butvar-phenolic glue. The calculated rupture strength coefficient of strip fiberglass reinforcement and the analysis of monolithic behaviour of metal and reinforcement proved the precondition as to the plasticity of a developed material. The process of force transmission between a steel pipe and fiberglass at ductile stage has been analyzed in the article. While forecasting the work of a pipe on-load, it is necessary to take into account nonlinearity of metal-fiberglass pipe properties.

Non-destructive control method of the state of objects operating long time

Trykoz L., Kamchatnaya S., Lyuty V., Borodin D., Atynian A.

Diagnostyka

2018

Vol. 19, No. 1

11--17

The development of a diagnostic system is a complex engineering problem aimed at preventing damage caused by deteriorating properties of the materials and structures. This article presents the method of nondestructive testing of change control of concrete structures. The analysis of literature data shows that the overwhelming majority of studies are devoted to the change in electrical resistance of concrete in the collection of its strength, and practically no analogous studies regarding its aging are presented. Theoretical substantiation of the change in electrical concrete characteristics (conductivity, resistance) is given with a change in its strength. A work over-bridge in operation more than 30 years has been surveyed. The experimental part consisted in measuring the electrical potentials on the bridge structures, as well as in determining the strength of the material at the same points. Correlation dependence between the measured electric potential value and the strength of the samples taken from the bridge structures were obtained.